JPH0818502A - Simultaneous multiple address communication transmission method in digital cordless telephone system - Google Patents

Abstract

PURPOSE:To obtain the inter-slave-set communication method in which simultaneous multiple address communication is conducted without increasing a traffic of a master set. CONSTITUTION:A group number G88(99) is preset in addition to an ID number (00-09) specific to each slave set. When the slave set 00 being a caller makes a call while designating a group number, plural slave sets in existence in a transmission area 1 replies an acknowledge only when the received group number and a group number registered in each of the plural slave sets are coincident to form a radio channel and receives a simultaneous multiple address communication signal from the caller slave set as a reception exclusive slave set.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital cordless telephone system, and more particularly to a simultaneous broadcast transmission method using inter-slave communication.

[0002]

2. Description of the Related Art As shown in FIG. 5, a conventional broadcast transmission system in a conventional cordless telephone system includes a plurality of slave units 50, master units 51a to 51c dedicated to incoming calls, and a master unit dedicated to outgoing calls. 52a to 52c, and an exchange 54 for connecting these masters to an extension (or outside) telephone 53 by wire (Japanese Patent Laid-Open No. 2-241128).

In this conventional system, when the extension telephone 53 performs a hook-off operation, the extension telephone 5
3 and the exchange 54 are linked. Then, when a call is made to the child device 50 in the area, a ringing tone signal is output from the exchange 54 to the call-dedicated parent devices 52a to 52c. When a common ID code for performing simultaneous broadcast communication is input from the extension telephone 53 to the slave unit 50 by a push button operation, the ID code is transmitted via the exchange 54 to the master unit 52a for calling only. 52c.

Next, the call-dedicated master units 52a to 52c make a call to the slave unit 50 in the zone, and the slave unit 50 and the call-dedicated master units 52a to 52c are connected by a wireless channel. As a result, it becomes possible to receive simultaneous broadcasts by the slaves in the area.

[0005]

In the simultaneous broadcast transmission of this conventional cordless telephone system, since the extension telephones perform the broadcast transmission to each slave unit through the exchange and the master unit, the extension line is transmitted. There is a problem that only the telephone can perform the broadcast transmission.

Further, since the wireless area between the master unit and the slave unit is used, if the slave unit leaves the master unit and leaves the area, the broadcast cannot be received. In addition, since the wireless slot of the base unit is used, if another slave unit wants to use it during a broadcast other than the broadcast, there is a problem that it cannot be connected to the base unit depending on the usage status of the radio slot.

An object of the present invention is to provide a communication method between slave units that performs simultaneous broadcast transmission without increasing the traffic volume of the master unit.

[0008]

SUMMARY OF THE INVENTION In a broadcast transmission method between slave units according to the present invention, a plurality of slave units are composed of a plurality of groups identified by a group number, and a slave unit specifies a group number. When a wireless channel is formed with a plurality of cordless handsets having the group number, the calling side cordless handset broadcasts to the plurality of cordless handsets having the wireless channel. The feature is to do.

In other words, each slave unit according to the present invention is
It has a group number in addition to an individual number, and only when a group number that matches its own group number is received, a response is returned to the calling side handset to form a wireless channel, and the signal from the calling side handset is unidirectionally sent. To receive.

More specifically, the I
In addition to the D number, a specific group number is given in advance. Each cordless handset compares the group number transmitted from the transmitting side cordless handset with the group number registered in the own station,
Only when the group numbers match, the local station returns a response to the calling side. Then, the calling side child device performs simultaneous broadcast transmission to the plurality of child devices that have returned the responses. At the time of simultaneous broadcast transmission, the receiving side slave units are exclusively for reception and transmission is prohibited.

[0011]

The present invention will be described below with reference to the drawings.

FIG. 1 is a system configuration diagram for explaining a broadcast transmission method according to the present invention. A specific group number G is preset for a plurality of slave units in the system. As an example, it is assumed that the slave unit numbers 00 to 05 are set to the group number 77 and the slave unit numbers 06 to 09 are set to the group number 88. In addition, cordless handset number 00
Is set as a transmitter, and the transmitter number “0
The description will be given assuming that there are child devices of 1 ”to“ 09 ”.

FIG. 2 is a transmission operation flowchart in an embodiment of the simultaneous broadcast transmission method according to the present invention.

The sender (slave unit number 00) is group number 8
When performing simultaneous broadcast transmission to the slave units of 8 (Y in step S11), the operator selects "88" from the keypad of the slave units.
And press the off-hook key (step S1).
2). The originating side handset 00 uses the group number 88 to
A wireless call is made to the child device in the transmission area (step S13). In this case, as will be described later, there is a response only from the slave units with the slave unit numbers 06 to 09 belonging to the group number 88 (step S13). When this response is received, a call can be made between the calling side and the receiving side handset.

However, since the transmission function of the reception side slave unit is prohibited by means such as muting, it functions as a dedicated reception unit (described later). This one-way call from the calling side child device to the receiving side child device realizes simultaneous broadcast transmission between the child devices (step S15). This state is terminated by pressing the on-hook key on the originating side handset (Y in step S16).

On the other hand, in the case of normal one-to-one communication between slave units (N in step S11), the operator of the transmitting side slave unit inputs the number of the partner slave unit from the numeric keypad and presses the off-hook key. Then (step S17), the other handset is called (step S18). If there is a response from the receiving slave unit (step S1)
9), a normal one-to-one call is made (step S20),
It continues until it is on-hook (step S16).

FIG. 3 is a flow chart of an incoming call operation in this embodiment. As described above, the cordless handset (0
0) is called with the group number 88, the slave unit number 0
It is received by the slave units 1 to 09. When each slave unit receives the call (step S21), it receives the group number 88 (Y in step S22). Therefore, it is compared with the group number (77 or 88) preset in each slave unit (step S21). Step S
23). At this time, since the group numbers of the slave units 06 to 09 match, the process proceeds to the subsequent step S24, but the slave unit 01
˜05 is judged as a group number mismatch (step S2).
3 N), return to the incoming call waiting state.

From the slave unit 06, which is determined to have the same group number
09 returns a response to the calling slave device 00 (step S24), and also causes the ringer to ring to notify the operators of the slave devices 06 to 09 that an incoming call has been received (step S25).

When these operators press the off-hook key (step S26), the call can be received and the simultaneous broadcast communication is carried out only to the slave units 06 to 09 belonging to the group number 88 (step S27). At this time, the transmission function of the receiving side child device is stopped, and the reception side is dedicated to reception. This listening state continues until the on-hook key is pressed (step S2).
8).

On the other hand, in the case of a normal one-to-one call (N in step S22), it is judged whether or not the received destination slave unit number matches its own slave unit number (step S29), and it must match. If so, the call returns to the incoming call state, and if they match, a response is returned to the calling side handset (step S30). Then, the ringer is sounded to notify the operator (step S31), and the operator presses the off-hook key (step S32) to enable a one-to-one call (step S33). In this case, since the transmitting function of the receiving side child device is not stopped, normal two-way communication can be performed. This call state continues until the on-hook key is pressed (step S28).

FIG. 4 is a sequence diagram showing the simultaneous simultaneous transmission operation in FIGS. 2 and 3. First, the calling side slave unit makes a call by designating a group number, and only the slave unit having the corresponding group number among the plurality of receiving side slave units responds to the call. Then, when the receiving side goes off-hook, broadcast transmission is performed from the transmitting side to the plurality of receiving side slave units. At that time, the reception side slave unit stops the transmission function and becomes one-way communication.

[0022]

As described in detail above, in the method of broadcasting communication between the handset units of the digital cordless telephone system according to the present invention, a specific group number is given to each handset unit in advance,
Since it is possible to receive a voice only when the receiving side slave unit has the same group number, simultaneous broadcast transmission can be performed without intervening the master unit, and an increase in the traffic volume of the master unit can be avoided.

[Brief description of drawings]

FIG. 1 is a system configuration diagram for explaining a broadcast transmission method according to the present invention.

FIG. 2 is a flowchart of the operation on the calling side in one embodiment of the broadcast transmission method according to the present invention.

FIG. 3 is a call flow operation flowchart in the present embodiment.

FIG. 4 is a sequence diagram for simultaneous broadcast transmission in this embodiment.

FIG. 5 is a block diagram showing an example of a conventional broadcast transmission system.

[Explanation of symbols]

 1 Transmission area 00-09 Remote unit number 77 Group number 88 Group number

Claims (3)

[Claims] 1. A digital cordless telephone system comprising a plurality of handset units, wherein the plurality of handset units comprises a plurality of groups identified by a group number, and an arbitrary handset unit designates a certain group number to make a call. When a wireless channel is formed with a plurality of handset units having the group number, the originating side handset unit broadcasts to the plurality of handset units having the channel. A simultaneous broadcast transmission method using the featured inter-unit communication. 2. The broadcast transmission method according to claim 1, wherein the plurality of slaves having the channel formed therein are prohibited from transmitting and operate only by receiving. 3. A digital cordless telephone system comprising a plurality of cordless handsets, each cordless handset having a group number in addition to an individual number, and transmitting only when a group number matching its own group number is received. A simultaneous broadcast transmission method comprising: returning a response to a slave unit to form a wireless channel, and unilaterally receiving a signal from the originating slave unit.